Lithium metal anode, fabrication method thererof, and lithium secondary battery comprising same anode

Patent metadata

Field	Value
Publication number	US-2019348668-A1
Application number	US-201716473087-A
Country	US
Kind code	A1
Filing date	Dec 15, 2017
Priority date	Dec 23, 2016
Publication date	Nov 14, 2019
Grant date	—

Abstract

One embodiment of the present invention relates to a lithium metal anode. Wherein the lithium metal anode comprises a current collector and a lithium metal thin film layer disposed on at least one surface of the current collector and having a thickness in a range of 0.1 to 200 μm and a coating layer disposed on a surface of the lithium metal thin film layer, wherein, the coating layer comprising a Li—N—C—H—O based ionic compound.

First claim

1 . A lithium metal anode comprising:
a current collector; a lithium metal thin film layer disposed on at least one surface of the current collector and having a thickness in a range of 0.1 μm to 200 μm; and a coating layer disposed on a surface of the lithium metal thin film layer, wherein, the coating layer comprising a Li—N—C—H—O based ionic compound.

2 . The lithium metal anode of claim 1 ,
wherein the coating layer further comprises LiF.

3 . The lithium metal anode of claim 1 ,
The Li—N—C—H—O based ionic compound comprises Li—O, C—N, C—O, and C—H bonds.

4 . The lithium metal anode of claim 1 ,
The Li—N—C—H—O based ionic compound is at least one of the compounds represented by formulas (1) and (2).
Li +− [O—R 1 —R 2  n 1 A 1 −+ Li  [Formula 1]

(wherein in the formula 1, R 1 and, R 2 are each CH m F 2-m (m is one of 0, 1, or 2), A 1 is

and n1 is an integer of 1 to 10)

(wherein in the formula 2, R 3 , and R 4 are each CH m F 2-m (m is one of 0, 1, or 2),
A 2 is

and n2 is an integer of 1 to 10.)

5 . The lithium metal anode of claim 4 ,
the compound represented by the formula (1) is at least one of the compounds represented by the following formulas (1-1) and (1-2), and the compound represented by the formula (2) is at least one of the compounds represented by the following formulas (2-1) and (2-2).

(wherein in the formula 1-1, n3 is an integer of 1 to 5.)

(wherein in the formula 1-2, R 5 and R 6 are each CH m F 2-m (m is one of 0, 1, or 2), and n4 is an integer of 1 to 5.)

(wherein in the formula 2-1, n5 is and integer of 1 to 5.)

(wherein in the formula 2-2, R 7 and R 8 are each CH m F 2-m (m is one of 0, 1, and 2), and n6 is an integer of 1 to 5.)

6 . The lithium metal anode of claim 1 ,
wherein a thickness of the coating layer is in a range of 2 nm to 2 μm.

7 . The lithium metal anode of claim 1 ,
wherein a thickness of the coating layer is in a range of 10 nm to 500 nm.

8 . The lithium metal anode of claim 1 ,
the lithium metal thin film layer has a flat surface microstructure without dendrite, and the lithium metal thin film layer comprises a columnar structure extending upward from the current collector.

9 . The lithium metal anode of claim 8 ,
wherein an average diameter of the columnar structure is in the range of 0.1 μm to 100 μm.

10 . The lithium metal anode of claim 1 ,
wherein an average pore fraction of the lithium metal thin film layer is 10% or less.

11 . (canceled)

12 . (canceled)

13 . (canceled)

14 . (canceled)

15 . (canceled)

16 . (canceled)

17 . (canceled)

18 . A lithium secondary battery comprising:
an anode; a cathode; and electrolyte, the anode is a lithium metal anode according to claim 1 .

19 . A lithium metal anode comprising:
a current collector; a lithium metal thin film disposed on at least one surface of the current collector; and, a protective layer disposed on the surface of the lithium metal thin film.

20 . The lithium metal anode of claim 19 ,
a thickness of the lithium metal thin film is from 5 μm to 100 μm.

21 . The lithium metal anode of claim 19 ,
a thickness of the protective layer is from 10 nm to 100 nm.

22 . The lithium metal anode of claim 19 ,
wherein the protective layer comprises at least one selected from the group consisting of F, P, C, O and S.

23 . (canceled)

24 . (canceled)

25 . (canceled)

Assignees

• Posco
• Res Inst Ind Science & Tech

Inventors

• Kim Jin Hong
• Bae Hong-Youl
• Cho Mun Kyu
• Choi Nam Soon
• Lee Sang-Lag
• Bae Weon-Soo
• Lee Yong Won
• Moon Ji-Woong

Classifications

• H01M4/0423

  Physical vapour deposition · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title